Penstock Inspection and Safety Assessment Program: Big Thompson PowerplantColorado-Big Thompson Project, Colorado. Review Report, Great Plains Region

摘要

On February 26-28, 1997, and June 16-17, 1997, the Big Thompson penstock wasinspected. During the exam the following tasks were performed: (1) The condition of the exposed exterior coating and the interior lining of the penstock was inspected; (2) The wall thickness of the steel penstock was determined by ultrasonic testing; (3) Appurtenances where the penstock and piping connected to the penstock change in diameter or where the water flow changes in direction were inspected; (4) Joints, piping connections, and various associated operating equipment (gates, valves, etc.) were inspected; (5) Load rejection tests, unwatered governor testing, and emergency gate closure tests were performed.